Crossword Genius

Daft travelling by rail while getting the hang of the toot (5,8)

Ross

I believe the answer is:

potty training

I'm a little stuck... Click here to teach me more about this clue!

'rail while getting the hang of the toot' is the definition.
I can't tell whether this defines the answer.

'daft travelling' is the wordplay.
'daft' becomes 'potty' (I've seen this in another clue).
'travelling' becomes 'training' (I am not sure about this - if you are sure you should believe this answer much more).
'potty'+'training'='POTTY-TRAINING'

'by' is the link.

Can you help me to learn more?

(Other definitions for potty training that I've seen before include "Behavioural lessons for the very young" , "Post-nappy education?" .)

I've seen this clue in the Sydney Morning Herald.
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